{"id":"F2006B02222","name":"AD/AE 2100/1 - High Pressure Turbine Wheel","slug":"ad-ae-2100-1-high-pressure-turbine-wheel","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41452,"registerId":"commonwealth-F2006B02222-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)  \n\nRolls Royce (Allison) Turbine Engines \\- AE 2100 Series","sortOrder":0},{"sectionNumber":"AD/AE 2100/1 High Pressure Turbine Wheel","sectionType":"part","heading":"AD/AE 2100/1 High Pressure Turbine Wheel 7/2004","content":"# AD/AE 2100/1 High Pressure Turbine Wheel 7/2004\n\nApplicability: Rolls-Royce Corporation (formerly Allison Engine Company) models AE 2100A and AE 2100C turboprop engines with high pressure turbine (HPT) wheel part number (P/N) 23050912 installed; AE 2100A turboprop engine with turbine wheel P/N 23063462 serial number (SN) MM14062 installed; AE 2100A, AE 2100C, AE 2100D3 turboprop engines with 2nd stage HPT wheels with SN's prior to MM183060.\n\nRequirement: 1. Perform a one-time acid etch inspection to the 2nd stage high pressure turbine wheel in accordance with the Accomplishment Instructions contained in the following Rolls-Royce Alert Service Bulletins, Table 1.\n\nTable 1.\n\n| AE models | Rolls-Royce service bulletin                                                              |\n| --------- | ----------------------------------------------------------------------------------------- |\n| AE 2100A  | AE 2100A-A-72-234, Revision 2, dated October 13, 2000 orRevision 3, dated June 19, 2001.  |\n| AE 2100C  | AE 2100C-A-72-183, Revision 2, dated October 13, 2000 orRevision 3, dated June 19, 2001.  |\n| AE 2100D3 | AE 2100D3-A-72-179, Revision 2, dated October 13, 2000 orRevision 3, dated June 19, 2001. |\n\n    2. If damage is discovered, replace the turbine wheel with a serviceable part.\n\n    3. Do not install any 2nd-stage gas-generator turbine wheel listed in Table 2 of this Directive, unless it has been inspected as specified in Requirement 1 of this Directive.\n\nNote: FAA AD 2001-17-31 Amdt 39-12423 refers.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"This AD converts Rolls‑Royce Alert Service Bulletin inspection instructions into mandatory regulatory obligations for engines/parts identified in the Applicability. It compels one‑time inspection, mandatory replacement if damage is found, and prohibits installing listed 2nd‑stage turbine wheels unless inspected (Requirement 1–3), thereby extending the scope from recommended maintenance to enforceable compliance."},"complexity_factors":["Technical inspection method: requires an acid‑etch inspection procedure specified in multiple Rolls‑Royce Alert Service Bulletins (Requirement 1 and Table 1).","Cross‑reference to specific ASB revisions: compliance depends on following particular service bulletin revisions and their Accomplishment Instructions (Table 1).","Part‑number and serial‑number specificity: applicability is limited to listed P/Ns and SN ranges, requiring accurate fleet traceability (Applicability).","Regulatory conversion of manufacturer guidance: turns service‑bulletin guidance into mandatory regulatory requirement, changing enforcement and compliance obligations (Requirement 1–3).","Operational consequence: damaged wheels must be replaced with a serviceable part, creating a supply/maintenance action and scheduling impact (Requirement 2).","Dependency on a compliance schedule: the AD refers to a compliance timing section (not included in excerpt), so exact deadlines and prioritisation may affect implementation planning."],"plain_english_summary":"Makes mandatory a one‑time acid‑etch inspection of specified 2nd‑stage high‑pressure turbine wheels on Rolls‑Royce (Allison) AE 2100A/C/D3 turboprop engines (certain part and serial numbers). If damage is found the wheel must be replaced, and wheels listed in Table 2 may not be installed unless inspected. The directive adopts manufacturer service-bulletin instructions as compulsory action to correct an identified unsafe condition (Applicability; Requirement 1–3)."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific safety defect in a specific engine component. It has not expanded beyond its original purpose of mandating inspection and replacement of defective 2nd stage HPT wheels."},"complexity_factors":["Short, single-purpose directive with clear applicability criteria","Only 3 substantive requirements with straightforward conditional logic (if damage found → replace)","Cross-references to external technical documents (Rolls-Royce service bulletins) rather than internal legislative complexity","Minimal defined terms — relies on standard aviation terminology (P/N, SN, HPT)","Single compliance action (one-time inspection) with no nested exceptions or phased implementation","Clear table structure for identifying affected engine models and corresponding service bulletins"],"plain_english_summary":"This CASA airworthiness directive mandates a one‑time acid‑etch inspection of the 2nd‑stage high‑pressure turbine wheel on certain Rolls‑Royce AE2100A/C/D3 turboprop engines (specific P/Ns/SNs). Affected operators must inspect per Rolls‑Royce procedures, replace any wheel with detected defects, and not install uninspected wheels. It addresses risk of catastrophic, uncontained engine failure and aligns with FAA AD 2001‑17‑31."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ae-2100-1-high-pressure-turbine-wheel","history":"/api/acts/ad-ae-2100-1-high-pressure-turbine-wheel/history","analysis":"/api/acts/ad-ae-2100-1-high-pressure-turbine-wheel/analysis","conflicts":"/api/acts/ad-ae-2100-1-high-pressure-turbine-wheel/conflicts","importantCases":"/api/acts/ad-ae-2100-1-high-pressure-turbine-wheel/important-cases","documents":"/api/acts/ad-ae-2100-1-high-pressure-turbine-wheel/documents"}}